Improvement in stamping and crushing mills



WHELPLEY&STORER.

Ore Mill.

Patented Aug. 1, 1865.

I 01 ad ad odod'b z 0 0 ed o If (CI/es N. PETERS. Plmhrulhograghcr. Washington. In;

U ITED STATES PATENT OFFICE. a

J. 1). WHELPLEY AND J. J. STORER, OF nosron, msskcatsmrs,

IMPROVEMENT IN STAMPING AND CRUSHING MILLS.

To all whom it may concern:

Be it known that we, J. D. WHELPLEY and J. J. STORER, of Boston, in the county of Suffolk and State of Massachusetts, haveinvented a new and usefullmprovement in Friction-Surfaces of Grinding and Crushing Mills and we do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure 1 is a perspective view of one of our grinding or crushing mill heaters or paddles enlarged, and Figs. 2 and 3 are transverse sections of the same. Fig. 4is a plan of a perforated wrought-iron plate; and Fig. 5 isa similar view of a piece of interlaced wires or rods, to be embedded in the chilled cast-iron. Fig. 6 is a side elevation (the end being removed) of a pulverizing, grinding, or crushing mill with our heaters 01' paddles A attached to m dial arms or disks F F, revolving on an axle, G; and Fig. 7 is a front elevation representing two of our heaters or paddles attached, as

shown in Fig. 6, to said arms or disks.

Like parts are indicated by the sameletters in all the drawings.

Our present invention relates-to that class of grinding, crushing, or pulverizing mills in which the comminution is performed by means of rotating beaters or paddles attached to or between radial arms or disks revolving within a suitable case, H, as in the patent granted to us November 8, 1865. These heaters or paddles have hitherto been constructed either of hardened steel or common or chilled castiron, the practical objection to which beaters or paddles has been, when made of'hardened steel, their great expense when made of common cast-iron, their softness and frangibility; and when made of chilled cast-iron alone, their excessive brittleness and liability to fly to pieces, thereby badly injuring, rupturing,- or spoiling the mill.

The nature of our improvement therefore consists in the application to a. mill of the above description 0t heaters or paddles of chilled cast-iron, with which, whilein a molten state, is incorporated wrought-iron or other suitable malleable metal, consisting either of perforated plates or interlaced rods or wires,

as hereinafter described, whereby the said heaters or paddles are rendered sufiiciently tough and hard to resist the required concussion and attrition to which they are exposed.

To enable others skilled in the art to make and use our improvement, We will now proceed to describe the construction of the beater or paddle and the method of attaching the same to the radial arms.

In an ordinary mold of the requisite form, of damp sand or metal, such as is commonly used for making chilled cast-iron, we place a plate of perforated wrought-iron, c, or interlaced rods or wires d, suspending it or them centrally in the mold, by causing its or their ends or sides to enter recesses in the same, or in any other obvious manner. The wroughtiron being thus suspended or fixed in the mold or chill-box, the molten cast-iron is poured in in the usual manner, completely surrounding the wrought-iron and becoming incorporated with it, as represented in Figs. 1, 2, and 3. By this means it is obvious that the surface of the cast-iron and that portion which comes in contact with the wrought-iron d or 0 will be chilled to the requisite hardness, while at the same time the perforated or interlaced wrought-iron,firmlyembeddedinthecastiron, i

will give the latter the requisite toughness to withstand concussion.

The plate A, Fig. 1, is intended-for one of the heaters or paddles of the above-described mill, and is attached to the radial arms or disks F F by means of bolts i passed through the holes E E formed in the casting by means of cores corresponding to holes E E, beingpre viously made in the wrought-iron, as represented in Figs. 4. and 5.

We do not confine ourselves to perforations of any particular size or shape, nor to any par ticular arran gementof wrought metallic wires, rods, or bars, as these may he obviously varied at pleasure, as circumstances may require.

Beaters or paddles thus constructed pos sess, together with the requisite toughness,

the usual hardness of common chilled castiron without its brittleness and liability to fly to pieces, and they are for many purposes equal to hardened steel, oreven superior to it, while the actual cost of producing them is comparatively small.

Having thus described the nature and operation of our improvement, what we claim as new, and desire to secure by Letters Patent, is-

In combination with the radial arms or disks of a grinding, crushing, or pulverizing mill, the employment of a plate, paddle, or beater,

VA, constructed of chilled cast-iron incorpo- 

